When developing and launching a new electrical/electronic product for the North American market, the question will arise - which NRTL (Nationally Recognized Testing Laboratory) should we use to get our product safety certified?
Probably the most likely answer is to use Underwriters...
Dave,
The fact that UL accepted (or made) the entry in your UL file whereby the PLC manufacturer name/model number was not required is a very good sign.
In my experience with these generic file entries, UL tends to put the headline electrical ratings and sometimes a particular parameter in this...